As it has previously done for iPads, Best Buy is now running a trade-in promotion for Microsoft's Surface tablet. The retailer is guaranteeing that customers will receive a gift card worth at least $200 when they trade in a working Surface at a participating Best Buy location. The most Best Buy will give you is $350, so if making maximum profit is your goal, eBay or Craigslist may be a better option for offloading your current Surface ahead of Microsoft's latest hardware. Then again, these deals are never really the most lucrative path; they're an easy and quick way to get back at least some cash for an old device. To be eligible, the Surface that's being traded in must power on, be free of any water / liquid damage, and the screen can't be cracked. The gift card promotion runs through October 21st, just one day before the arrival of Surface 2 and Surface Pro 2